Thermostat circuit for 2 pt100 temperature measurement used atmega8 mikrüdenetleyici sensor pt100 sensors gives the circuit output is being used according to the information received. The thermostat is located on the circuit board led display temperature value. Connect the relay outputs can be controlled by a variety of devices, TRIAC, etc. PT100 sensor, Thermostat for the project in the c source code and eagle pcb, schema drawings.